Gas burner



April 8, 1930. P. w. MccoY 1,753,613

GAS BURNER INVENTUR PN/kCor.

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ATTORNEY Patented Apr. 8, 1930 UNITED STATES PHILIP WM.

PATENT OFFICE.

MCCOY OF TOLEDO, OHIO, ASSIGNOR TO THE SURFACE COMBUSTION COM.-

PANY, INQ, OF TOLEDO, OHIO, A CORPORATION OF NEW YORK ens BURNER Application filed ifanuary 10, 1929. Serial No; 331,540.

This invention relates to improvements in I gas burners and more particularly to gas burners for burning premixed air and city or artificially made fuel gas.

The invention has for its object to provide a gas burner of the character indicated which shall not back-fire into the mixture supply on a low turn-down and which shall not tend to blow off at the tip when operating at maximum capacity.

Referring to the drawings wherein the preferred form of the invention is shown: Fig. 1 is a diametral cross section through the burner;

Fig. 2 is a bottom plan of the burner and Fig. 3 is a radial cross section of the/burner, showing ribs instead of wires for spacing the central plug from the tubular member.

In the drawings, 10 indicates a cylindrical plug over which is telescoped a tubular member 12, the plug and member being maintained in spaced concentric relation in any suitable manner for the purpose of forming a restricted annular feed passage 14 for the 2 gaseous mixture to be-burned. The feed passage is made sufiiciently small to prevent back flash or flame propagation therethrouglrunder any conditions of operationof the burner. One end of the member" or body 12 is exteriorly threaded as at 16 to permit the burner to be screwed into a supply manifold (not shown). Theplug 10 terminates short of the outlet end of the member 12'whereby there is formed a relatively shallow pit or well the r upper rim of which'is indicated-at 18. This pit is provided with an annular undercut or groove 20. .The form of the undercutis preferably as shown in Fig. 1, the angle at the lower edge 22 of the well rim or throat 18 being preferably not less than a right angle with the side walls of the undercut sloping outwardly. I k c The plug 10 may be maintained in spaced concentric relation in the bore of the body 12 in any suitable manner as by means of'spacer wires 24, disposed in parallelism with the axis of the plug. Four such wires are shown in Fig. 2. For convenience in assembling, the wires are preferablycross-connected at their upper ends by bending the wiresv to U form and the plug vforced into the bore with the wire straddling the plug. A cross pin 26 may be provided for more positively preventing relative axial displacement between the plug I i and the member 12.

Instead of providing spacing wires, inwardly projecting axially extending ribs 24 may be provided either as integral parts of the plug 10 or of the member 12 as shown in Fig. 3. t

The tubular member 12 and the body 10 are preferably made of a heat-resisting alloy so as to more eflectually withstand the high temperatures caused by burning premixed fuel gas and air.

'The mode of operation of the burner is as follows: The fuel gas is premixed with air inany suitable manner by apparatus not shown and delivered .under pressure to the inlet to the burner below the plug 10, the mixture passing through the annular feed passage 14 into the pit for burning. Where the dilferential pressurebetween the atmosphere and the mixture issuing from thefeed passage 14 's relatively low, the'mixture will burn around the tip of the burner within the outer edge thereof, the annular groove or undercut 22 having very little effect on the manner of the burnin of the mixture. Where, however, the di erential pressure between the atmosphere and the mixture issuing from the feed passage 14 is'relatively great, the undercut 22 interferes with the smooth flow of the mixture in a manner to setup swirling with the result that the pit or well is completely filled with the mixture. The mixture, therefore, burns in much closer proximity to the plug 10 than it otherwise would do. "This will.

- tioned that there issufiicient air for complete combustion. Such mixtures burn with a very short bluish flame and unless the burner is properly designed, will blow-off atthe 'slighty est provocation. The present burner is susceptible of operation over a relatively great range of turn-down andthere is not the slightest tendency for the flame to 'blow off evenlthroughthe mixture supply should be suddenly increased.

- The diameter of the well rim 18 ispreferably the same as: the diameter of the bore wherein the plug 10 is positioned.- Some variations in the relative diameters may,

body and having its concentric walls close. enough to prevent flame propagation thereso through, and an annular recess formed in said passage having concentric walls close enough to prevent flame propagation therebetween, said plug terminating adjacent said undercut. 6. A gas burner comprising a cylindrical plug, a tubular member telescoped over said plug, means for-maintaining said plug and member in spaced concentric relation to establish an annular feed' passage with its concentric walls close enough to prevent flame propagation therebetween, said plug termi- 7r nating short of the outlet end of said member, 9 and an undercut formed in said member ad,- jacent its outlet end I 7. A- gas burner comprising a cylindrical Y plug, a tubular body within which said plug 86 is supported in concentrically spaced relation to provide a restricted annular feed passage for the gaseous mixture to be burned, said plug terminating short of the outlet end of said body whereby a shallow well is provided, the well being undercut below its top, the rim at the mouth of said well having substantially the same internal diameter as the oute wall of the feed passage. In testimony whereof I aflix my si nature. an

PHILIP WM. Mo oY..

body between the discharge end of said feed pasisage and the adjacent terminal of said' 2. gas burner, adapted to burn premixed aafuel gas and air, compr sing means forming an annular feedpassage with 1ts concentrlc walls close enough to prevent flame propagation therethrough, means forming a relatively short tubular extension from the discharge end of said feed passage, and an annular recess formed within said extension. 3. A gas burner adapted to burn premixed fuel gas and air, comprising a relatively short tubular pit having an annular undercut,

and means forming an annular feed passage v terminating adjacent said undercut, the rim at the outletof said pit having substantially the same internal diameter as the outside wall of the feed passage.

50 4. A gas burneradapted to burn premixed fuel gas and air, comprising a relatively short tubular pit having anannular undercut, and means formingan annularfeed passage for enterin a tubular sheet of premixed 5:; air and fuel gas mto the pit at the, base there-' of, thediameter of said undercut being great er that the diameter of said feed passage, and the walls of said feed passage being close enough to prevent flame propagation there- 60' through.

5. A gas burner comprising a-tubular body having an undercut adjacent one end thereof,

' and a. plug betweenthe walls of which and the walls of the tube is formed a feed passage 65. for the gaseous mixture to be burned, said 

